I purchased upgrade from LR4 to LR6 a couple of months ago. Yesterday, after two months of flawless function, I was unable to open LR and that continues today. There are no messages, no warnings or questions, just not opening. Any advice?

I have downloaded LR 6 from the link you supplied. When I try to run it I get this message (which I recall running into several months ago also and which took forever and some chat room support to overcome). What do I do next please?

" The procedure entry point_crtCreateSymbolicLinkW could not be located in the dynamic linl library MSVCR110.dll"

Happily I have LR6 back. The two repairs worked just fine and I wish to thank everyone for their advice. My only remaining concern is the short message in the upper left corner that reads: "0 days left in Lightroom mobile trial." I am hoping that Adobe does not think that I downloaded a trial version!

You can dismiss that message if you hover your mouse top left over the name plate. Click the dropdown icon that appears and that will open the activity window. You can pause the LR mobile trial and forget it.

I should also ask, Should I click yes on the app updates to CC 2015 if I do not subscribe to CC but rather have simply downloaded the upgrade from LR 4 to LR 6? I don't want to end up with a subscription.